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. 2019 Dec 17;10:2891. doi: 10.3389/fmicb.2019.02891

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Copyright © 2019 Chang, Hou, Pan, Huang, Han, Bin, Deng, Li, Ding, Gao, Zhi, Yang and Bi.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) The number of bacterial species isolated varies with time under aerobic conditions. (B) The number of bacterial species isolated varies with time under anaerobic conditions. (C) The pH value of the pre-culture varies with time under aerobic conditions. (D) The pH value of the pre-cultures varies with time under anaerobic conditions. Results are shown as means ± SEM. (E) The effects of pH on the likelihood of isolating different bacteria, p < 0.05.